Herbicidal method for combating shattercane

ABSTRACT

A two-component herbicide combination consisting essentially of 2-chloro-4-cyclopropylamino-6-isopropylamino-s-triazine and alachlor gives better control of certain weeds than either of these herbicides alone. Pre-emergence use of the combination on corn gives a wide spectrum of weed control without injury to the corn.

United States Patent Schwartzbeck Jan. 30, 1973 [54] HERBICIDAL METHODFOR [56] Reference s Cited COMBATING SHATTERCANE UNITED g [75] Inventor:fi' schwaflzbeck olathe 3.442945 5/1969 Olin ..71 93 3,503,971 3/1970Neighbors et al. ..71/93 Assignee: Research Development Com. HUSlCd .Ql8 pany, Pittsburgh, Pa.

. Primary Examiner-James 0. Thomas, Jr. [22] F June 1970 Att0rneyRichardL. Kelly, Carl A. Cline, Forrest D. [211 App]. No.: 45,575 Stine andHoward F. Van Denburgh Related US. Application Data [57] ABSTRACT [63]ggg of A twocomponent herbicide combination consisting essentially of2-chloro-4-cyclopropylamino-'6- isopropylamino-s-triazine and alachlorgives better ..7l/:36l7nl/9l/; control of certain weeds than either ofthese herbi [58] Field 71/93 1 l8 cids alone Pre'emergence use of thecombination on corn gives a wide spectrum of weed control without injuryto the corn.

1 Claim, N0 Drawings IIERBICIDAL METHOD FOR COMBATING SIIATTERCANE Thisis a continuation-in-part of U. S. Pat. application Ser. No. 853,475filed Aug. 27, 1969.

DESCRIPTION OF THE INVENTION ln.the parent application it was disclosedthat 2- chloro-4-cyclopropylamino-b-isopropylamino-s- RESULTS OFPEE-EMERGENCE GREENHOUSE TESTS- oN HERBICIDE VCVOYMBIVNATIONS 21b.alachlor and 1 lb. triazine Barn- Grain Shatteryard Green Crab- MorningVelvet Nut Yellow Treatment (lo/A.) Cor s g um a g ass tail grass gloryleaf grass foxtail h k h l ht, inches 11 8 8 10 3% 3 2y 5 1 C 0c eg 0 0so 90 100 100 0 (i 0 g 0 80 90 100 100 100 0 0 0 95 0 so 90 100 100 1000 0 0 90 0 80 90 100 100 100 0 0 90 0 80 90 100 100 100 0 o 0 100 0 0 00 0 0 80 0 0 0 0 0 20 20 0 90 95 0 0 0 0 0 95 80 100 100 100 0 90 1 1b.triazine 0 0 0 00 95 100 100 100 0 i 7 v 'RESULTSafinmnemmceGREE'NHBU'SFT TESTS 0N HERB ICIDE COMBINATIONS Barn- Grain ShatteryardGreen Crab- Morning Velvet Nut Yellow Treatment (lo/A.) Corn sorghumcane grass foxtail grass glory leaf grass foxtail 3 lb. alachlor and lb.triazine 0 0 8 00 100 I00 80 100 0 90 fib. alaehlorand @111 mo e g g 33p53 1% p 1% o 1 1%11). alachlor and A 1 tna m 0 90 100 100 100 100 100m0 0 100 triazine interacts in an interesting manner with certain otherherbicidal compounds to product combinations superior to eitherherbicide alone when used in certain specific weed control situations.It has now been discovered that the combination of this herbicide with2-chl0ro-2',6'-diethyl-N-(methoxy-methyl)acetanilide (alachlor) may beused at relatively low levels of application to control unwantedvegetation such as morning glory and velvet leaf more effectively thaneither of the compounds used alone. By using a lower level ofapplication of the more effective combination, injury to the crop plantsis minimized.

Briefly, the present invention is a method of combat- 'ing unwantedvegetation comprising applying preemergently to the locus of thevegetation an effective amount of a mixture consisting essentially ofone part by weight of 2-chloro-4-cyclopropylamino-6-isopropylamino-s-triazine and from about one to about three parts byweight of 2-chloro-2',6'-diethyl-N- (methoxy-methyl)acetanilide.

COMBATING UNWANTED VEGETATION So as to illustrate the use of the methodof combating unwanted vegetation under controlled conditions to yieldmeaningful quantitative data there is described with water containing noherbicide and was placed on the greenhouse bench and given the sameamount of It will be seen from examination of the tabulated data thatthe alachlor herbicide is ineffective on morning glory and velvet leafeven at rates as high as 3 lb per acre. The triazine also fails to givecomplete control of these two weeds at application rates belowthreefourths lb per acre. However, it will be seen that the combinationof one-half lb of alachlor and one-half lb of triazine gives completecontrol of both morning glory andvelvet leaf and does so without injuryto either corn or grain sorghum. An improvement in the control of yellowfoxtail is also evident at the rate of one-half lb of each herbicide.For serious weed infestation in corn, as can be seen from the tabulateddata, higher rates of application can be used to give substantiallycomplete control of all of the weeds in the test, with the exception ofnut grass, without substantial injury to corn. The two herbicides may beapplied simultaneously from separate spray mixes through separate spraynozzles or wettable powders or dispersible concentrates of each of thetwo herbicides may be conveniently mixed in a spray tank so that thecombination is sprayed together. Alternative mixtures of the twoherbicides may be prepared in suitable form, for example, as wettablepowers, so that only one mixing operation in the spray tank isnecessary. The preferred use of the combination is the pre-emergencecontrol of weeds in corn where the weed infestation is particularlyserious.

Iclaim:

1. The method of combating shattercane in the presence of corncomprising applying pre-emergently to the locus of the shattercane aneffective amount of a mixture consisting essentially of one part byweight of 2-chloro-4-cyclopropylamino-6-isopropylamino-striazine andfrom about one to about three parts be weight of 2-chloro-2',6'-diethyl-N- (methoxymethyl)- acetanilide.

